▎ 摘　　要

NOVELTY - Method for preparing a graphene metal composite material, involves (a) providing metal powder, graphene powder and a binder, (b) mixing the metal powder, the graphene powder and the binder into a powder material, heating the SP3 bond bonding each functional group to break by friction and separating the functional groups from respective graphene molecules, bonding each graphene molecule with another graphene molecule by the broken SP3 bond, and wrapping the respective metal particles by the graphene molecules, (c) heating the powder material to melt into a liquid mixture material mixed of the metal powder, the binder in liquid phase and the graphene powder, (d) injecting the liquid mixture material into a mold for molding and solidifying to form a green part, (e) removing the binder from the green part to transform the green part into a brown part, and (f) sintering the brown part to melt the metal particles into a metal main part. USE - The method is used for preparing a graphene metal composite material. ADVANTAGE - The method prepares graphene metal composite material with excellent heat transfer performance. DETAILED DESCRIPTION - Method for preparing a graphene metal composite material, involves (a) providing metal powder, graphene powder and a binder, where the metal powder comprises metal particles, the binder comprises a wax material, the graphene powder comprises graphene pieces, each graphene piece comprises graphene molecules connected with each other, each graphene molecule comprises 6C annually connected with each other, and one of the carbon atoms of each graphene molecule is connected with a functional group by an SP3 bond, (b) mixing the metal powder, the graphene powder and the binder into a powder material, heating the SP3 bond bonding each functional group to break by friction and separating the functional groups from respective graphene molecules, bonding each graphene molecule with another graphene molecule by the broken SP3 bond, and wrapping the respective metal particles by the graphene molecules, (c) heating the powder material to melt into a liquid mixture material mixed of the metal powder, the binder in liquid phase and the graphene powder, (d) injecting the liquid mixture material into a mold for molding and solidifying to form a green part, (e) removing the binder from the green part to transform the green part into a brown part, firstly solvent debinding the green part to remove a part of the binder and transforming the green part into the brown part with pores in it, and sequentially thermal debinding at 140-170 degrees C, and (f) sintering the brown part to melt the metal particles into a metal main part and forming the graphene molecules into a three-dimensional mash embedded in the metal main part.